#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main()
{
    int a;
    while (scanf("%d", &a) != EOF)
    {
        char hollow[50][50];
        for (int i = 0; i < a; i++)
        {
            for (int j = 0; j < a; j++)
            {
                if (i == 0 || j == 0 || i == a - 1 || j == a - 1)
                    printf("* ");
                else
                    printf("  ");
            }
            printf("\n");
        }
    }
    return 0;
}